package com.sky.Aspect;

import com.sky.annotation.AutoFillCommonFields;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.Signature;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.time.LocalDateTime;

/**
 * 自定义切面，实现公共字段自动填充的切面类
 */
@Aspect
@Component
@Slf4j
public class AutoFillCommonFieldsAspect {

    /**
     * 切入点
     */
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.AutoFillCommonFields)")
    public void autoFillPointCut(){

    }

    /**
     * 前置通知，在通知中进行公共字段的赋值
     */
    @Before("autoFillPointCut()")
    public void autoFill(JoinPoint joinPoint){
        log.info("开始进行公共字段自动填充...");

        //判断获取到的数据库操作类型
        MethodSignature signature = (MethodSignature) joinPoint.getSignature();
        AutoFillCommonFields autoFillCommonFields = signature.getMethod().getAnnotation(AutoFillCommonFields.class);
        OperationType operationType = autoFillCommonFields.value();
        //获取被拦截方法的参数列表
        Object[] args = joinPoint.getArgs();
        if(args == null || args.length == 0) return;
        Object entity = args[0];

        //准备赋值的数据
        LocalDateTime time = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();

        //根据不同的操作类型进行复制
        //Insert操作需要对四个字段都进行赋值
        //Update操作只需要进行两个字段的赋值操作
        if(operationType == OperationType.INSERT){

            try {
                Method setCreateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
                Method setCreateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);

                setCreateTime.invoke(entity,time);
                setCreateUser.invoke(entity,currentId);
            } catch (Exception e) {
                throw new RuntimeException(e);
            }
        }
        try {
            Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
            Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);

            setUpdateTime.invoke(entity,time);
            setUpdateUser.invoke(entity,currentId);
        } catch (Exception e) {
            throw new RuntimeException(e);
        }



    }

}
